Method of and apparatus for tamping waste in filter cartridges



Sept. 12, 1950 H. DAHL 2,521,833

METHOD OF AND APPARATUS FOR TAMPING WASTE IN FILTER CARTRIDGES 3 Sheets-Sheet 1 Filed July 14, 1947 H. DAHL METHOD OF AND APPARATUS FOR TAMPING Sept. 12, 1950 2,521,833

WASTE IN FILTER CARTRIDGES 3 Sheets-Sheet 2 Filed July 14, 1947 INVENTOR.

000090000000000000000 OOOOOOOOOOOOOoOoO-DD once 0 H. DAHL METHOD OF AND APPARATUS FOR TAMPING WASTE IN FILTER CARTRIDGES Sept. 12, 1950 s Sheds-Sheet 3 Filed July 14, 1947 ("II/11111111111.vlllnlnalllllllia"lulrnllllll llrflnlh 1 llllllllllllgll IIIIIIIIIII/IIIII,II/IIIIIIII;IIII,IIIIII/IIIIIlI/IIIIIIiI,

IULIJ Patented Sept. 12, 1950 METHOD OF AND APPARATUS FOR TAMPIN G WASTEIN FILTER CARTRIDGES Hilmer nah], Chicago, Ill., assignor to Wm. W. Nugent & 00., Inc.', Chicago, III., a corporation of Illinois Application July 14, 1947, Serial No. 760,823

' 4 Claims. {91.226-49) continuous fabric. cover or envelope and more a particularly, to filter cartridges, ofthe kind described, also having a perforated metallic core.

Among the objects of the invention is to provide an improved method for packing the filtering material within a continuous length of tubu- H lar fabric to form a filter cartridge of thecharacter hereinabove mentioned.

A further object is to provide an improved apparatus for forming a filter cartridge of the character hereinabove mentioned. I I e Other objects and advantages of the invention will appear from time to time as the following description proceeds. H v

The invention may best be understood by reference to the accompanying drawings in which: n 1

Figure l is a perspective view of a completed' cartridge of the kind to whichmy inventionrelates.

Figure 2 is an enlarged verticalsection of the cartridge shown in Figure 1.

' Figure 3 is a perspective view of a filling form '25 constituting part of the filling apparatus used in connection with my improved filling process.

Figure 4 isa vertical section taken through the filling form shown in Figure 3, illustrating one of the first steps in applying a continuous length of fabric tube or stockinetf to the filling form preparatory to the packing operation.

Figures 5 and 6 respectively, show subsequent steps in the process including aifixing the stockinet temporarily to the filling form preparatory to the packing operation.

Figure 7 is a view similar to 5 and 6, but showing the packing or filling process in successive steps.

Figure 8 is a view similar to the preceding figures, but showing the cartridge after it has been completely packed with filtering material, and illustrating the method of lapping one end of the stockinet over the proximate end of. the

cartridge. v

Figure 9 is a sectional view of the cartridge after it has been removed from the filling form, but with a temporary core member retained therein, and illustrating the method of preparing the apparatus for lapping and tucking the opposite end of the stockinet into the com- .plete assembly.

Figure 10 is a side view of the permanent core member of the kind adapted for final assembly in the completed cartridge,

' Figure 11 is a section taken on line H,' H of Figure 10, but drawn'to a larger scale than the latter figure.

Figure 12 is a perspective view of a clamping fixture forming part of the apparatus for inserting the permanent core in the filter cartridge.

Figure 13 is a longitudinal section showing the clamping fixture illustrated in Figure; 12, together with associated parts of" the apparatus for inserting the permanent core in the filter cartridge.

Referring now to'details of the embodiment-of my invention illustrated in the drawings, the form and construction of a typical filter cartridge to which the present inventionis directedis indicated at 10 in Figures 1 and 2. Such a typical filter cartridge consists essentiallyof a central core ll, preferablyformed of metal in generally tubular shape, open at both ends and having perforated corrugated side walls I2, withja p1uj-- rality of perforations; l3 therethrou'gh. Said core is surrounded by a cylindrical filtering member, including a fabric cover or sheath l4, filled with filtering material l5 such as waste. f

The fabric cover I4 is preferably formed of a continuous length of tubular knittedmaterial commonly termed a stockinet, which tubular material is somewhat elastic, capable ofbeing formed in a continuous envelope completely surrounding the cylindrical, hollow body of filtering material [5. One of the principal objects of the present invention is to provide a simple and eco, nomical method and apparatus'for packing the filtering material within the'fabric cover or envelope". M in ass'embled'position around the central core H in such a manner as to overlapthe free ends ofthe stockinetor tubing fabric with each iother'to form a filter cartridge whichwill maintain its shape while being packed or transiported for assembly or replacement in alfilter filter 'cartridges which may be employed for fill:

tering .01] or other liquids when used in filter casings of variouskindsgwell known in the art, Referring more particularly .to the method and apparatus ior forming" the typical filter'cartridge shown in Figures] '1 .and 2, a filling form 20, in Figures 3 and 4 is employed which is normally closed at its bottom end 2| and is provided with a removable clampin ring 22 surrounding its open upper end 23.. The clampinglring' maybe of any suitable form, herein'consisting of a split from the filling form, as will hereinafter more fully appear.

As shown in Figure 4, the filling form 28 'is provided with a temporary central tubular core.

member 35 which is removably mounted therein, as on an upright stud 36 formed integrally with the bottom wall 2| and terminating slightly below the open upper end of said form. The removable core member 35 normally extends slightly above the rim of the filling form and is hollow throughout its length, excepting for a restricted annular shoulder 3'? formed close to its upper end.

Ininitially preparing the filling form for packing, an annular ring 39 having a grooved undersurface 40 is fitted around thenpper lip of the form 20. A stockinetindicated at 30 is .cut to the length required for forming the final cover or envelope of the cartridge. ,One end 39* of the stockinet is-inserted in the upper end of the ire movable core 35, with a substantial part of its terminal portion projected, through the restricted shoulder portion 31 said tube, as shown .in Figure 4. The main body portion of the stockinet may be drawn loosely. over theouter side of the form .20, as shown in this latter figgure. .A cap member 4| is attached to the upper end of the tube 35 to secure the upperor first named end of said stookinet to said tube. ,In the form shown, the cap 41 has an integral, depending stud 42, screw-threaded at its lower end for engagement in a threaded aperture {Reinthe uppepend of the upright, stud 35, as shown in Figure5. r

The intermediate portion of said tube or stockinet is then positioned within the filling form.

To insure the smooth and evendisposition of the stockinet along the sides of the form a funnel like tubular member indicated at 45 ,is'finserted in close-fitting telescopic engagement within said form, asshown in Figure '5,,so asto stretchthe outer portion of thestockinet along the inner .suriace of the form 20.

, The opposite end portion of thelstoc kinet which, to distinguish from the first named .end will, be termed herein, the second end, is then secured to the-outer rim of the fill-ingf-fo m by means :of the clamping ring 22, as shown in Fig- ,ure .5. A suflicient length of fabric tubing is left below the clamping ring to provide an overlap -for the upper end of the cartridge, as 'willlhereinafter be described. I I

A smaller tubular member fi may then be fitted telescopically over the cap 41 and coref to the full depth'o'ffthe form, so as to" dispose v the {inner portion of the stockinet in proper relation along core member 35, as shown in Fig,- ure 6. If desired, a suitablerod or stick 41 may also be inserted in the filling form to insure proper positioning of the 'stockinet against the bottom of said Jform,,as indicated indotted lines in Figure 6. I I

The smaller tube 45 and stick 4! are then removed from the form, and filtering material may then be packed'in the filling vf rm by introducing it in relatively small quantities through the flared upper end of the funnel-like member 45, and tamping it down while the stockinet is supported against the inner walls of said form. The fun nel-like member 45 is gradually raised as the filling proceeds, as indicated in Figure 6, or in some .cases, it may be found practicable to remove the funnel-like member 45 entirely from the form, once the filling operation has commenced.

Figure 7 illustrates a further stage in the filling process in which a hollow plunger 48 may be employed to apply pressure to successive layers of filtering material as they are inserted in the form. Figure 7 also shows a part-length, funnellike member 50, which is shorter than the first named funnel member 45, and may be substituted for the latter if desired, after the form becomes partially filled. In either case, the funnel members 45 or 50 are gradually elevated as thepacking operation proceeds, so that the filtering material will fill the entire space between the inner ,andouter upright portions of the stoclginet in supporting engagement with the side wall 32 and the removable core member 35.

When the form is completely filled with filtering material to a level with the upperrim of the filling form, the cap 4| is unscrewed from the fixed central stud 36 and is removed from the top of the core member 35. This releases the first end of the stockinet, which was previously secured by the cap member 41. The said first end of the stockinet is then drawn outwardly to lap over the exposed upper surface of the filling material, and its extreme outer end is then tucked downwardly around the outer edge of the filling material. Figure 8 illustrates a preferred methodof accomplishing this tucking operation, with the aid of a relatively short cylindrical member made of thin metal adapted to fit closely Within the'rim 39 at the upperfend of the filling form. The first end portion of 'the stock inet is drawn outwardly over the outer edgeof the rim, as indicated in dotted lines in Figure 8: the tubular member 55is then applied to the form and pressed downwardly with a twisting movement so as to tuck the free end of the stock inet inside of the formfbut outside of dreadjacentfilling material as indicated in Figure 8. When the tubular member 55 is withdrawn-from the form the first end of the stockinet will be retained in its fully tucked underlapped position, by the expanding pressure of the filling material, as indicated in Figure 9.

The cartridge with its filling material is then removed from the filling form 20, but with the re-' movablecore 35 retained therein, as indicated in .Fi-gurefl.

To remove the cartridge from the filling form 23 the clamping ring 22 is released and removed so as to free the second end portion of the stockinet. This will permit access to the rin '39 and permit it to be removed iromthe upper edge of the filling form. Thereafter, the side wall portions 32, 32 may be spread'outwardly to permit the cartridge to .bereadily removed from the filling form in the condition shown in Figure 9. The second end portion of the stockin'et 30 "is then lapped over the first end portion of the stockinet at the upper end of the cartridge, with its extreme end permanently tucked into the opening in the upper end of the cartridge and retained by the permanent core member H. To accomplish this, the extreme end of said second portion is tucked into the upper end of the re.-

movable core member core -member3 5,'

.;.;-.'I'o, carry outthis part of the process, I mount the cartridge in a suitable ;holding device 60, shown in detailin Figures l2 and,,l3., I Said holding device consists oftwo hinged jaws GI and 62, which are open at their opposite ends and are connected together by detachable fastenings M 63, 63' which may be similar in const'ri'iction to the detachable fastenings 24, 25, 26 heretofore described for securing the" ends of "the split clamping ring 22 together. The holding device 60 is mounted on a suitable base 64, which in turn is mounted on an elongated support 65, which for the purpose of illustration in Figure 13 is disposed in a horizontal plane.

The cartridge indicated at HP, together with the temporary core member 35 positioned therein as shown in Figure 9, is first mounted in the clamping device 60. The permanent core member H is then forced against the upper end of the temporary core member 35 by suitable means, such as a plunger 66 which engages the opposite end of the core member II, to force the temporary core member 35 out of the cartridge and replace it by the permanent core member II. A stop member 61 ma be mounted on the support 65 at a predetermined distance from the clamping member 60 so that the endwise movement of the temporary core member 35 will be stopped when the permanent core member H reaches its desired final position in the cartridge.

It will be observed that since the second end of the stockinet is initially retained between the bottom end of the permanent core member and the shoulder 31 of the temporary core member during this ejecting movement, the free end of the stockinet will be pushed inwardly with the two core members so as to be drawn tightly over the adjacent end of the cartridge and thence inwardly into the end opening, where it will either be automatically withdrawn from its frictional engagement between the two core members or in some instances the extreme end portion of the tube engaged between the core members may be actually out or torn from the tube. In either case, however, the free end of the fabric tube will assume its final position shown in Figure 2, wherein it is held under expanding tension between the outer wall of the permanent core member II and the adjacent filling material.

Although I have shown and described certain steps and forms of apparatus for the manufacture of filter cartridges, it will be understood that various modifications may be employed therein without departing from the spirit and scope of my invention, as defined in the appended claims.

I claim:

1. In apparatus for packing hollow filter cartridges, a cylindrical packing form open at its upper end and having an axially extending support therein fixed to the bottom thereof, a hollow temporary core member removably mounted on said support and normally extending upwardly beyond the upper end of the latter, and also extending above the rim of said cylindrical form, means for securing the upper end of said core member to the upper end of said support, means for securing one end of a fabric tube to ill the upper end of said core member, and other means for securing the opposite end of said fabric tube around the rim of said packing form, while the intermediate portion of said tube is being filled in said form. v

2. In apparatus forpacking hollow filter cartridges, a cylindrical packing" form open: at its upper end and having an axially extending support therein fixed to the bottom thereof, a, hollow temporary core member removably mounted on said support and normally extending upwardly beyond the upper end of the latter, and also extending above therim of said cylindrical form, means for securing the upper end of said core member to the upper end of said support, the upper end of said means including acap for securing one end' of a fabric tube to the upper end of said coremember; and other means for securing the opposite end of said fabric tube around the rim of said packing form, while the intermediate portion of said tube is being filled in said form.

3. The method of packing filtering material in a hollow, cylindrical filter cartridge having a continuous inner and outer fabric cover and a permanent central core member, which consists of providing a, cylindrical packing form of substantially the intended diameter and length of the cartridge, said form having a temporary removable core member therein, anchoring a length of fabric tube for forming said cover adjacent one end thereof to the outer end of said temporary core member, inserting a temporary stretching cylinder within said cylindrical form for substantially the full length of the latter to shape said fabric tube to its full outside diameter, anchoring the other end of said tube to the outer rim of said cylindrical form, packing the portion of said fabric tube intermediate its anchored points with filtering material to form the filtering body of the cartridge while supported within said packing form, then unanchoring the fabric tube from said temporary core member, drawing it outwardly over the adjacent end of said cartridge and tucking its free end between said filtering material and the inner face of the opposite end of said fabric tube, then unanchoring said last named tube end from said form and removing said cartridge and tube fabric from said form, lapping said last named tube end over the adjacent end of said cartridge, and replacing said temporary core member by said permanent core member, with the free end of said last named tube end underlapping the adjacent end of said permanent core member and secured thereagainst by compression of the adjacent filtering material of said filtering body.

4. The method of packing filtering material in a hollow, cylindrical filter cartridge having a continuous inner and outer fabric cover and a permanent central core member, which consists of providing a cylindrical packing form of substantially the intended diameter and length of the cartridge, said form having a temporary removable core member therein, anchoring a length of fabric tube for forming said cover adjacent one end thereof to the outer end of said temporary core member, inserting a temporary stretching cylinder within said cylindrical form for substantially the'full length of the latter to shape said fabric tube to its full outside diameter, anchoring the other end of said tube to the outer rim of said cylindrical form, packing the portion of said fabric tube intermediate its anchored points with fiItering material to form thefiltering body of said; cartridge while sup ported within said packing form; then unanchoring the fabric tube from said core member, drawing it outwardly over the adjacent end of. the cartridge and tucking its free end between said filtering material and the inner face of the opposite end of said fabric tube, then--unanchoring said last named tube end from said form and removing said cartridge and tube fabricirom a cartridge and become secured under compressaid form with said removable 'core'member retained in said cartridge, fitting 'apermanent core member on the end of said'temporary corememher with said last namedtube end irictionaliy engaged between said core members, and pressing said permanent core member longitudinally into said cartridge to displace said temporary core member and cause said last-named tube end to be lapped over-the adjacent end of said.

sion between the end of said permanent core member and the proximate inner face of the inner'iabric tube portion when said permanent core member is in its assembled position within said cartridge. 1 I

' HILMER DAHL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Winslow et a1 Apr. 4, 

